corps of Royal Engineers, was placed on half-pay for seven months. During the next ten years Smith was employed on various military duties in England. He was promoted to be regimental lieutenant-colonel on 16 March 1830, and was appointed commanding royal engineer of the London district. In 1831 he was made a knight of the Royal Hanoverian Guelphic Order by William IV, a Knight Bachelor on 13 September of the same year, an extra gentleman usher of the privy chamber in 1833, and on 17 March 1834 one of the ordinary gentlemen ushers. The last post he held until his death. On 2 December 1840 he was also appointed inspector-general of railways, in which capacity he examined and reported on the London and Birmingham Railway and the other principal railways before they were opened to the public. In 1841 Smith, in conjunction with Professor Peter Barlow, made a report to the treasury respecting railway communication between London, Edinburgh, and Glasgow. Smith resigned the appointment of inspector-general of railways at the end of 1841, and became director of the Royal Engineer establishment at Chatham on 1 January 1842. On 5 July 1845 Smith and Professors George Airy and Barlow were constituted a commission to inquire whether future parliamentary railway bills should provide for a uniform rail gauge, and whether it would be expedient or practicable to bring railways already constructed or in course of construction into uniformity of gauge. On 30 March 1846 he was appointed one of the five commissioners to investigate and report upon the various railway projects in which it was proposed to have a terminus in the metropolis or its vicinity. On 9 November 1846 Smith was promoted to be colonel in the army, and on 1 May 1851 he was moved from Chatham to be commanding Royal Engineer of the southern district, with his headquarters at Portsmouth. In July 1852 Smith was returned to parliament as member for Chatham in the Conservative interest, but in March 1853 he was unseated on petition. He was promoted to be major-general on 20 January 1854. In 1855 he was transferred from Portsmouth to the command of the Royal Engineers at Aldershot. He was appointed public examiner and inspector of the East India Company's Military Seminary at Addiscombe in 1856. In March 1857 he was again returned to parliament as member for Chatham. He resigned his command at Aldershot, finding